binos vs field glass

binos

noun

  • binoculars 

field glass

noun

  • A pair of binoculars for observing "in the field". 

  • The larger of the image lenses of an optical device. 

  • A small monocular refracting telescope. 

How often have the words binos and field glass occurred in a corpus of books? (source: Google Ngram Viewer )